ENHANCED VIEWING - Experience superior solar observation with this filter, designed to fit iOptron 70-90mm telescope tubes, revealing intricate solar details. OPTIMAL CLARITY - Achieve exceptional image contrast with the 60mm aperture, expertly minimizing glare and maximizing the visibility of sunspots and solar flares. PRECISION FIT - Guarantees secure and precise fitting with a 4.10' (104.14mm) ID, ensuring the filter stays firmly in place during your astronomical observations. SOLAR PROTECTION - Protect your eyes and equipment using advanced Solarlite film, filtering out 99.999% of intense sunlight for safe solar viewing sessions.